• 開校かいこう

  opening a school

• 開会かいかい

  opening of a meeting

• 開廷かいてい

  court session, trial

• 開閉かいへい

  opening and shutting, opening and closing

• 開戦かいせん

  outbreak of war, starting a war

• 開きひらき

  opening, gap

• 開業かいぎょう

  opening a business, opening a practice

• 開店かいてん

  opening a new shop

• 開票かいひょう

  counting ballots, tally (of votes)

• 開墾かいこん

  cultivating new land, clearing, reclamation

• 開始かいし

  start, commencement, beginning, initiation

• 開演かいえん

  curtain raising, starting (e.g. play, concert)

• 開発かいはつ

  development, exploitation (of resources)

• 開設かいせつ

  establishment, opening, setting up, inauguration

• 開幕かいまく

  raising the curtain

• 開城かいじょう

  surrender of a castle, surrender of a fortress, capitulation of a stronghold

• 開示かいじ

  release (of information, documents, etc.), disclosure, display

• 開口かいこう

  opening, aperture (e.g. camera)

• 開催かいさい

  holding (a conference, exhibition, etc.), opening, hosting (e.g. the Olympics)

• 開放かいほう

  opening (a door, window, etc.), leaving open

• 開館かいかん

  opening (for that day's business; of a library, museum, cinema, etc.)

• 開場かいじょう

  opening (the doors of a venue)

• 開局かいきょく

  opening (of a broadcasting station, post office, bureau, etc.), establishment

• 開封かいふう

  opening (a letter, parcel, etc.), breaking the seal

• 開港かいこう

  opening a port (seaport, airport, etc.), starting operations at a port

• 開花かいか

  flowering, blooming, blossoming, coming into bloom

• 開国かいこく

  founding a country

• 開通かいつう

  opening (of a new road, railway, etc.), going into operation (e.g. telephone communication), beginning services

• 開拓かいたく

  reclamation (e.g. of wasteland), cultivation, development

• 開くあく

  to open (e.g. doors)

• 開くひらく

  to open, to undo, to unseal, to unpack

• 疎開そかい

  evacuation (to the country)

• 公開こうかい

  opening to the public, making available to the public, exhibiting, unveiling, release (of a film, information, etc.), disclosure, publication

• 打開だかい

  break in the deadlock

• 再開さいかい

  reopening, resumption, restarting

• 展開てんかい

  development, evolution, progression, unfolding, (plot) twist

• 満開まんかい

  full bloom (esp. of cherry blossom), full blossom

• 未開みかい

  uncivilized, uncivilised, primitive, savage

• 開発者かいはつしゃ

  developer

• 開発部かいはつぶ

  development department

• 開拓者かいたくしゃ

  pioneer, settler, colonist

• 開業医かいぎょうい

  private clinician, physician in private practice

• 開発元かいはつもと

  developer (of software, video games, etc.)

• 開けるあける

  to open (a door, etc.), to unwrap (e.g. parcel, package), to unlock

• 開けるひらける

  to open out (of a view, scenery, etc.), to spread out, to become clear (of a road, visibility, etc.), to open up

• 再開発さいかいはつ

  redevelopment

• 非公開ひこうかい

  private, non-public, secret, closed-door, closed

• 幕開けまくあけ

  rise of the curtain, opening of a play

• 店開きみせびらき

  starting a business

• 公開中こうかいちゅう

  now available (e.g. for sale), now showing (e.g. film, exhibition)